I hate stupid rules.And, I disagree that changing a size category for a first level spell is too powerful. It is also dependent on duration.
Plus, a larger creature is also easier to hit. Or inversely, a smaller creature does not hit as hard.
I see no real problem with gaining reach and a little bit of strength while losing AC for a first level spell or losing offense to gain defense. I just wish the designers would have given us better rules with regard to these two spells.
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